Simple Authentication for Desktop apps with Keycloak.

keycloak.json

{
  "realm": "local-user-import",
  "auth-server-url": "http://192.168.99.1:8080/u/auth",
  "ssl-required": "external",
  "resource": "app-edrewe",
  "credentials": {
    "secret": "29ddfb71-53fa-446d-aed5-2ce6de1fe490"
  },
  "use-resource-role-mappings": true
}

main.java

package demo;

import org.keycloak.adapters.installed.KeycloakInstalled;
import org.keycloak.representations.AccessToken;

public class Main {

    public static void main(String[] args) throws Exception {

        KeycloakInstalled keycloak = new KeycloakInstalled();

        keycloak.loginDesktop();

        System.out.println("Logged in...");
        AccessToken token = keycloak.getToken();
        System.out.printf("UserId: %s%n", token.getSubject());
        System.out.printf("Username: %s%n", token.getPreferredUsername());
        System.out.printf("Email: %s%n", token.getEmail());

        System.out.println(keycloak.getTokenString());

        System.in.read();
    }
}